Fluorite
Calcium Fluoride (CaF2)
mineral
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Often Associated With Sedimentary Sequences) in the encyclopedia
View all →
Limestone
Calcium carbonate (CaCO3)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine
Quartz (SiO2) - variety Citrine
Mineral
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Gold bearing Quartz with Sulfides
Auriferous Quartz with Pyrite/Arsenopyrite (Au + SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Quartz Geode in Chert/Limestone Matrix
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Grey Chert River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Unakite (Epidotized Granite)
Epidotized Granite (composed of Epidote, Orthoclase, and Quartz)
metamorphic
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Brown)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartz Geode
Macrocrystalline Quartz (SiO2) within a geode structure
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
mineral
Pink Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Opaque microcrystalline Quartz (SiO2) with impurities
sedimentary
Pitted Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Jadeite
Jadeite, NaAlSi2O6
gemstone
Jade Bangle (Jadeite)
Jadeite (NaAlSi2O6)
gemstone
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral